/* layout.css - Emir (M1)
   Group file: check with everyone before changing.

   Page container, shared header/nav (the Flexbox bit every page
   shows), footer, and the responsive skeleton. Mobile first:
   base styles are the small-screen burger layout, then two
   min-width breakpoints at 640 and 1024 (master plan §6.1).
   Test at 360, 768, 1280. */

.wrap { max-width: var(--wrap); margin: 0 auto; padding: 0 var(--space-4); }

/* Sticky header so the nav is always reachable on long pages. */
.site-header {
    position: sticky;
    top: 0;
    z-index: 50;
    background: var(--surface);
    border-bottom: 1px solid var(--hairline);
    transition: background .25s ease;
}
.site-header .wrap {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: var(--space-3);
    padding-top: var(--space-2);
    padding-bottom: var(--space-2);
}

.brand {
    font-family: var(--font-mono);
    font-weight: 700;
    letter-spacing: .08em;
    color: var(--text);
    text-transform: uppercase;
}
.brand:hover, .brand:active { text-decoration: none; color: var(--text); }
.brand-suffix { color: var(--accent-text); }

/* on mobile the links are a drop-down panel under the header,
   shown when main.js puts .menu-open on the header */
.nav-links {
    display: none;
    position: absolute;
    left: 0; right: 0; top: 100%;
    flex-direction: column;
    gap: 0;
    list-style: none;
    margin: 0;
    padding: var(--space-2) var(--space-4) var(--space-3);
    background: var(--surface);
    border-bottom: 1px solid var(--hairline);
}
.menu-open .nav-links { display: flex; }
.nav-links a {
    display: block;
    padding: var(--space-2) 0;
    color: var(--muted);
    font-size: .95rem;
    transition: color var(--transition);
}
.nav-links a:hover, .nav-links a:active, .nav-links a[aria-current="page"] { color: var(--accent-text); }

/* the burger. Icon-only, so it needs the aria-label it has in the
   HTML. main.js syncs aria-expanded and closes it on Escape and
   on taps outside the header. */
.nav-toggle {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 40px; height: 40px;
    background: none;
    border: 1px solid var(--hairline);
    border-radius: var(--radius);
    color: var(--text);
    cursor: pointer;
    transition: color var(--transition), border-color var(--transition),
                background-color var(--transition);
}
.nav-toggle:hover, .nav-toggle:active {
    border-color: var(--accent);
    color: var(--accent-text);
    background-color: var(--track);
}

.nav-actions {
    display: flex;
    align-items: center;
    gap: var(--space-2);
}

/* section rhythm */
.page-section { padding: var(--space-6) 0; }
.page-section + .page-section { border-top: 1px solid var(--hairline); }

/* footer */
.site-footer {
    margin-top: var(--space-6);
    padding: var(--space-5) 0 var(--space-4);
    border-top: 1px solid var(--hairline);
    color: var(--muted);
    font-size: .85rem;
}
.footer-grid {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    align-items: baseline;
    gap: var(--space-3);
}
.footer-links {
    display: flex;
    flex-wrap: wrap;
    gap: var(--space-3);
    list-style: none;
    margin: 0;
    padding: 0;
}
.footer-links a { color: var(--muted); transition: color var(--transition); }
.footer-links a:hover, .footer-links a:active { color: var(--accent-text); }
.footer-tag {
    width: 100%;
    margin: var(--space-3) 0 0;
    font-family: var(--font-mono);
    font-size: .8rem;
    letter-spacing: .04em;
}

/* tablet and up: swap the burger for the inline link bar */
@media (min-width: 640px) {
    .nav-toggle { display: none; }
    .nav-links {
        position: static;
        display: flex;
        flex-direction: row;
        flex-wrap: wrap;
        gap: var(--space-3);
        padding: 0;
        background: none;
        border-bottom: 0;
    }
    /* text underline off here so only the animated ::after bar shows;
       base.css's global a:hover underline would double it up */
    .nav-links a { padding: 0; position: relative; text-decoration: none; }
    .nav-links a::after {
        content: "";
        position: absolute;
        left: 0; right: 0; bottom: -2px;
        height: 2px;
        background: var(--accent-text);
        transform: scaleX(0);
        transform-origin: left;
        transition: transform .25s ease;
    }
    .nav-links a:hover::after, .nav-links a:active::after { transform: scaleX(1); }
}

@media (min-width: 1024px) {
    .page-section { padding: calc(var(--space-6) + var(--space-3)) 0; }
}